BVR CCD photometry of the globular cluster NGC 1261

Details BVR CCD photometry of the globular cluster NGC 1261 BVR CCD photometry of the globular cluster NGC 1261

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1850a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 5, p. 1850-1864.

Astronomy and Astrophysics

Astronomy

13

Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Cameras, Interstellar Extinction, Metallicity

Scientific paper

The medium-metallicity globular cluster NGC 1261 has been observed in three colors BVR, and the photometry is compared with the CCD work of Bolte and Marleau (1989) in the range region V = 14-23. The agreement is extremely satisfactory over most of this range, showing no systematic deviations. The derived values for the main-sequence turnoff points are located at V(TO) = 20.12 +/- 0.10, with colors at B-V = 0.45 +/- 0.04, V-R = 0.25 +/- 0.02, and B-R = 0.70 +/- 0.04. Color-magnitude diagrams fitted to the theoretical isochrones of VandenBerg and Bell (1985) render a best age of 15 +/- 2 Gyr.

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